Right Angles in Nature

Tabular Iceberg, care of BBC

Although it looks like the future on a planet that is totally colonized by Megastructures and Ecumenopolises, this is a pretty common thing called a tabular iceberg. Nature is short on straight lines and definitely right angles, although Andy Goldsworthy would disagree.

Andy Goldsworthy made this. (Or did he?)

Ice, however, is good for straight lines. I do recall a drawing by a Japanese woodcut artist in a book about Modern Art. It was a frozen lake, just a bunch of straight lines, and predated the more abstract things to come out of the early 20th century.   

Notes:
Nasa photographs rectangular iceberg
Oct 2018, BBC

On Right Angles
Or why we tend to perceive right angles everywhere
Network Address, 2012

You Love Right Angles
AKA I'm Not a Right Angle You're a Right Angle!
Network Address, 2012